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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e5adfa63a0b2dda2e1fccf19f65899bf172bcd8d6131557bf74a2758d60d9bdd' 
  AND token = 'oaLN1P90xEb+6/8FjBOPxa51LiO2sX7drP8AdzhFNpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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