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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dac29927a6fb2bc1d2d4b17fc5ccf2fcb5e13949792a356ae3adf3f408278eba' 
  AND token = 'CJk4cF94f6Ty8uPcn4xzCTu0zJWtqcKVW3lIo1rQU1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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