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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d9b662eddd4efaee7e78ee3c7e317ce891b0a7f81056d904278f50040f8ba49' 
  AND token = '1CJOm5/lJ9DMMTqr/mhwD4oHX/8CETeullQjrWtS/sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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