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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fcd623141079181cb7bc60c1e79787e2ea447a137c4f0e1c761c907015163765' 
  AND token = '7KOcskcDYqpdpvR9HVShZ81RhBjODdG+d5CIOz3GC+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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