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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7faca6e33206c94ea996103292c1c5609a6361f833a0ac163be95553f70a7e92' 
  AND token = 'nt0meqeo7/cWzrDFE9V2TognK7v89xifmMF1wcC/hAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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