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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'faf4b7cf9520382c5bbc178cd85fb319a49c73aa1cfdf596dd2309f0c3fad862' 
  AND token = 'obKnFkirYpdrJyYtMPU8kR+HSt9veMHR+DQ2pIi9AXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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