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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c55258a85865cde8b5ea14ce6dd24e88e39f4239e26d98c60d5c38880609ecae' 
  AND token = 'QfF+GM7x44bKTg7VJgLDEYYcO87uEpziNocBMh6QDZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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