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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f273b5aa95bc0261dd9e9f20314c2bc4304331aed350c3ec92d04e81bec935ef' 
  AND token = 'T/INhpRgtHfed/hK38Mdn1djD4L3ssLKj3mu/X+cYkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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