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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa8cba0cc74ab2e28dbdbcdfe6738c12dd73f717604565aa23ec3a86d8cb8d4b' 
  AND token = 'ZyQi0wss58QHXlZS6NXgykUjmfQwkEjR2sDi+QXLiU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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