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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '07dc4ce6d6a89d683c905424adb68a59a86cb38d6434cc4f38e68464aa96b958' 
  AND token = 'OVSSkUr00FPvSoCoPWFUVW/1UaSyYA0y9QRsweTCd9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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