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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd39d4ecd614baa6b6fb7318905f70473ed6530fcb0ea4f774d6f5eb99d907e06' 
  AND token = 'LOc1PVWHA0npK9lA6zvyRYRiE2TY1Nqk7DkflqYAIjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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