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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa6ba1c57ad849a86bbd194d2a4188e92e9414155d6e8524e10229a40852d19d' 
  AND token = '8DCpiJQmvPTRLvmem/qmtNachIiF06IljM7HdXAvpyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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