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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4bf82b13d0e7fc840dfa2abd1de96298dbe4e15cf9c8103424067efdae770c4b' 
  AND token = 'eKuht3MmZflDI1wyw8l811L824NPsg21zttBkyOgoz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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