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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93599421ac2e667ac8e4e7a82cc669e573fb6f42d57c6a8df2b78048a1d043c9' 
  AND token = 'OxQZnbfZAmLyKs4Li7U0nAz9UccDLXuRjeNOWe+p06w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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