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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd575f50fc9f5987e99ecbf4db56f65cdf7c400ef94af29b65929a1abf4134abd' 
  AND token = 'pN7azRORtxOzQ13iVY1Kirp47tUOTAuo9ER33s/1qAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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