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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a32fa8d45bb47b1800a2e57a26e1a00dc0a7f949f4c1f88f063c7371cb2ae08' 
  AND token = '2iQXR+LJbaofsiOwWnEETyJPZuiyAiXa3aNHYa1Fej0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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