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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e7f774e6323cf0b4cb087bdbd963aa8b22e4c953b5f5ca4664b52ffa1f224b8' 
  AND token = 'Ojf33NdtFcfdlj9c70Unc9i2CjTREBKKaI+e8E5Ud3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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