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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff973401439373f91668f5fc79ce9de76a80194dd15807142e22c2e1b4c261a7' 
  AND token = 'SX7hFaf5y3cJA2tf51yysDWDcavAtml24uJ2M4KzxOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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