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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e022c9dff046b2a2862d3ee05a9f35dc842e0198050591a02b58d8ffcb72f3f' 
  AND token = '6tin5Y238aeo+0OYGxd73ZbMGpyMvXqBQAWlzEw1PuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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