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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c98f76aec026b169546ea0427726b97245d5232606f32a1da7fde1644dc36b5' 
  AND token = '4Vf1VSdCHFWkAV7h4r2vvfgkAOAxa2mkxUXNk17pwYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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