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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f70f18f5ce8f886784f3737d45898d7bd8f0cd50374bd116962637af9d81a5a' 
  AND token = 'p0TZ0RQNZ05YTaW59rymhr6Xv/ievnndF7zncH/R1uQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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