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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '700dd6afc72190f5fcbf7bf800b5b2b5abdca20ed2b2577daf772ca0584a632b' 
  AND token = 'sL4s1cIJHpmBXcKT2dqkm60g6zKHGFXyQHBrXYWH+Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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