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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93da353ed32dab1e14ab2a9a5054669ff9b2db9931f3b41a7076b8076d9f876c' 
  AND token = 'uiW1MMO2fV2+mEaqsF+zR1uo3RWU0yazpY4HzLTSSpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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