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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '738a6ef75f2010a19b36799af1c90bc70d0a825357f992ea733589052a76af96' 
  AND token = 'ZEmRY1uuoXPGglPgLdNxsBtrONJNiChyBbDiKN9NGr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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