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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b4c3a343a6c00e06a19ac0f41d83af010469e7fd5eac0665864024dfcfce4c6b' 
  AND token = 'tI4iC0wARksIWgdJtv4ZdQ1uZr24Kutm+yiZAY38RCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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