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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a0c8439a68b3f37dfa3745b81e4c3670ad00ddfde8b279305646b4900cbf418' 
  AND token = '6zs2vByMH8MWMOprHe3o3q4jdfqULDgcmoY7xis0qjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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