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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0bd939c27fe6611f2af5cd49f85da63f277eccec94f632f4bdf27e116327bb3d' 
  AND token = 'a/fbvdPfL2FfOMYhzNcSyc3N85li1/rTOopHns+0mbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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