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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '92b25ec3551a89890896dbadc563e3c98315dba03fb5faa4ffb9097d72cbbb09' 
  AND token = 'Nj/tbn8HbSAFeCZr71AF05ZVN9DOEd+AmVYespTJJjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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