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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62acc120883dfb63fcc321a829426bcf0d0f45e3ad794dc92b87df7a829de17b' 
  AND token = 'brpg4po6mGkGghPCBg1fLa9yRwRl0fBpLZetR6utT34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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