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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '16bd8174d1ff3dfbebbe185d3a4024eba6edd83536d598dbefc2e3e49ce07826' 
  AND token = 'twbUMW5XyGQ/+u72bRagV5dBggh+j0VWOK5X4Cp4E8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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