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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a048b25d691ab2c06f6ecc5bffca06d1264e51624801cdefea9470882c38f784' 
  AND token = 'LxJH4tOGIXhP4HRMQY58BO09Ykxj/YB5LWvhitLPod0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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