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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f13e119775c04dd009c2c89e2bd5870f26942933baa7707237797bba10b9f4a1' 
  AND token = 'pA0fBgXDyWXc3f/RVvSiwNLFdgbheF8SE/B5i38hbNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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