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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '48d7e7a277d3601600b9e5dd15b438951b8b2d4d61ca6c06e12a6ebb7a014a2e' 
  AND token = '3asvsDiziGN6sbeAZmaLRNb86U3at/eQOCzTYs+F0Sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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