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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa66c83ebc567386477aba3f668ddb33a0f98f0e806fb80089980ac6e42a5c88' 
  AND token = '7alrQXPi19U5b8biNAqHmRQB1q53+deL542e6x3o/H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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