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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e68a941ed6e836db82b428959ce85cbcfefa469f162853c5555fadeb627b704' 
  AND token = 'beaTkoG+OO+WODX0S679wO01Ph8Zc0s73BDCucLnOhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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