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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e527c7e11566ce1cb8ddc4df4429c63a4c9d5356b74280a2e6a1cdb4e1186e29' 
  AND token = 'GvW2ERsUo+GavHlEO6CTsZQhn6bFVUIVAHP3GHcGxU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}