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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b7bdb71038e1bf355456407b48daa5bf2f9e4d443fede6f412b7e7e47749f567' 
  AND token = 'vQKgkN+3iudHilZyimgkIolUnnOwxHq4ApMEYdTgWNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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