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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a67263cbec83b628ec039126d67b526b582189a4bbe19a6d0264332d3cb884e5' 
  AND token = 'z6QCaOHIxA5d0cgXltP/a34iaG4ub21yTrGiWaomKwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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