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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd28d70f944a9265995d92027b48bdf05c06c1785184824d2237d55f6475d52bc' 
  AND token = 'DROiCipWJ+Aiz3eNz5R8lLGqubdEyH3x+tePcsHGc+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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