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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30dfa2eb3484a23857a955d3a0a8cb9b5afe3e86c2959119cbcd2e875d0c35af' 
  AND token = 'ng1T4vltab5VdyDFo0MSB8dr1bWhyPjwzb/GMUP5YY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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