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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ea051a11db8f01d460d211cf23f0ff85e7071d5d45bff95d76a083ef62d9bec' 
  AND token = 'u0/6JuFw5y5vJV+scDIq4NrqXx/gX3pFMn7A1C4bgd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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