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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87f77a2f65e24e2250b031bb783fd1cae478c1b72aab4971005a75a6b17ee53d' 
  AND token = '5AqR66S125HcNelVWbbNWEDspdGxrYJ2mTSHkE+RpEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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