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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe3cb3e8b12afd9792644f45e3604c45dc9e3e121ae7a4bd267a9ab39921bc8f' 
  AND token = 'AEaeoziXV1pAAVPD0E0NjD/G18ghOPjH4fze9FhpG7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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