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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0af9b25e07033bb9bf76a2777b0bfae2b2111a80ffdbf53a141df56a0ee7177' 
  AND token = 'nXp762ZmIKc+d0Ul+Ld+XRzFgRyOxaa5eewRrH5IcL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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