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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41138b941cc95deaf32477460d26776203bc56cfd6e71b773e006a3a07d1956e' 
  AND token = 'J1n5U2mNn0HgQwCRa8JkVDugNtYtQWmt730nobyhbaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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