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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d47e2ef0bea4ede6718bdb5de43e086e284b72609d6e8830181c9b944e602c1' 
  AND token = 'ft1BHt3nfmixg3Mh4mb6hPdF1qB+Rac9kWTAQn+d0Pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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