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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b4262afb8b7ca43d8242525625b5c571cd70c742d830a79824a7eef03408f3e7' 
  AND token = 'oJuN4VIR84PLX0MlzYBb4fsZOaafb0wi5fz0qLJuBno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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