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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '697fe53f25050365d0d0cb37472219420f1dd86996345d9fab3f3093f7998123' 
  AND token = 'aaBwS9p5nt7M/ZWy0mlRaKKUiDfxdkhkuikISq7FrGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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