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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '21969c3bd2b656338c750ba51d127179bc95525e7c3b48cc936c50f3c2559c3c' 
  AND token = 'rlokjTXEFG5YoBVRH0ECu5P334LdAtQkQ0QsSrLNF8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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