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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '48187516b8386c270b8bbdc659780361ce3b7933cb035611f724c16efbd37a36' 
  AND token = 'ePLoxVkxvTDbfhxOd8dt4Uv+l7pDDl5ZKobzDIlbp6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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