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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4347e963d1d07cb7ab23cc953a51f8ded44ba1d40dfc542528cfeba42a58e90' 
  AND token = 'DGsWCCRmctfR2qiHcV6oY4JEKDZGf6e30V9AbVBoP8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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