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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '608372fa5d83263237339ef187b4869d5c082f68fd8d79173c120548561cb8d2' 
  AND token = 'wX7nZfWsLgoJdIsQotlRcsxqbQnFFuEy3KEre01u824=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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