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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f401320f97bd4db21068c62eca8f25e50f0abcdaa5196bd59dfd1bff212691b8' 
  AND token = 'T1DTscoiowY+lo/IfWmPEiRnYSZp6btYF0t7fBPCk38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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