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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2c593eb3b25445e407a693efccf6198fa1c96dfc302c2207adff2f54be1294c' 
  AND token = '17BXPyE2XlHfjoUEtIPl98x/laljkW1F/NIQDutU25g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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